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參數(shù)資料
| 型號： | UCC2857 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Isolated Boost PFC Preregulator Controller |
| 中文描述： | 隔離升壓PFC前置穩(wěn)壓器控制器 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 127K |
| 代理商： | UCC2857 |
UCC1857
UCC2857
UCC3857
PRELIMINARY
DESCRIPTION
The UCC3857 provides all of the control functions necessary for an Iso-
lated Boost PFC Converter. These converters have the advantage of trans-
former isolation between primary and secondary, as well as an output bus
voltage that is lower than the input voltage. By providing both power factor
correction and down conversion in a single power processing stage, the
UCC3857 is ideal for applications which require high efficiency, integration,
and performance.
The UCC3857 brings together the control functions and drivers necessary
to generate overlapping drive signals for external IGBT switches, and pro-
vides a separate output to drive an external power MOSFET which pro-
vides zero current switching (ZCS) for both the IGBTs. Full programmability
is provided for the MOSFET driver delay time with an external RC network.
ZCS for the IGBT switches alleviates the undesirable turn off losses typi-
cally associated with these devices. This allows for higher switching fre-
quencies, smaller magnetic components and higher efficiency. The power
factor correction (PFC) portion of the UCC3857 employs the familiar aver-
age current control scheme used in previous Unitrode controllers. Internal
circuitry changes, however, have simplified the design of the PFC section
and improved performance.
(continued
)
Isolated Boost PFC Preregulator Controller
8
15
4
VD
13
7
3
VIN
CAO
CA–
MOUT
PKLMT
14
MOSDRV
16
IGDRV1
18
IGDRV2
17
PGND
20
CT
6
AGND
19
RT
20
SS
5
VREF
12
DELAY
11
VAO
10
VA–
2
CRMS
1
IAC
REF
REF
Z
V
Z
C
R
S
Q2
Q1
T1
FEEDBACK
CKT
OPTO
BIAS
SUPPLY
QA
R
AC
V
OUT
–
+
RECTIFIED
AC INPUT
REF
UCC3857
C
F
TYPICAL APPLICATION CIRCUIT
FEATURES
PFC With Isolation, V
O
< V
IN
Single Power Stage
Zero Current Switched IGBT
Programmable ZCS Time
Corrects PF to >0.99
Fixed Frequency, Average Current
Control
Improved RMS Feedforward
Soft Start
9V to 18V Supply V Range
20-Pin DW, N, J, and L Packages
02/99
UDG-98065
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC2858 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Efficiency, High Power Factor Preregulator |
| UCC2858 WAF | 制造商:Texas Instruments 功能描述: |
| UCC2858DW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Factor Controller |
| UCC2858DWTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Factor Controller |
| UCC2858J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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